Replacing Rotor on Mark III Norton commando

[Norton Margie]

My alternator blew up. :mad I cleared the wreckage and ordered new parts

A friend and I got the rotor on the shaft and started to tighten the nut (first wiping threads with Locktite Blue)

Problem: Although we have the bike in gear, are standing on the rear brake and are blocking up the rear wheel, I can only torque to 25 foot pounds before the primary chain starts to turn. Suggestions?

 

[augustiron]

Jamb something between the primary and it's sprocket so when ot turns, the object jambs the chain/sprocket.

Soft material preferable, like a block of wood, but metal will work in a pinch.

Don't let splinters fall.into the engine.

 

[ejv]

If I'm understanding your issue correctly, I had a similar problem replacing a water pump on an old Acura I had.
In putting it back together I was using a pulley tool on the crankshaft pulley to hold it while trying to torque down the nut.


Ended up crushing the pulley so I had to source one of those and then replace that. Asked around to see if there was a better way. Mechanic I knew told me what to do.

He told me to keep everything from turning,
put string into one of the cylinders enough to keep the piston from being able to finish it's stroke. Just pulled a plug and put maybe a 12-18" length of string (fairly thick as I recall) into the chamber. Worked like a charm. But that perhaps isn't recommended for every vehicle. I am not sure where that stress gets transferred to.

 

[kuksul08]

Impact gun with a torque stick

 

[Lucytriple]

Yeah, impact and I like using pennies between those gears or even a nice thick rag should do the trick. Sometimes I hold things with my chain vice grips when I don't have the proper holder.

https://www.acehardware.com/departments/tools/hand-tools/solid-joint-pliers/21714?x429=true&gclid=Cj0KCQiA_qD_BRDiARIsANjZ2LBt0LriOHpsv2T5lgNSIKf-GeLkUYHQGED7TWdQBjk6fdxhDWk4AnEaAkCKEALw_wcB&gclsrc=aw.ds

 

[Norton Margie]

Thanks for input. Don't have an impact gun. Need to reseach this more, concerned about breaking something.

 

[ejv]

Those chain vice grips are similar to the chain wflrench that I crushed that pulley with that I referenced. I suppose it depends on what you are trying to torque it down to.

 

[Eric B]

I like the penny idea. Easy to source. A piece of aluminum will work too. A little less common.

 

[CDONA]

I used wood inclosed in an old sock to contain splinters, jammed into the primary chain to pull the crank compensator from my fat boy's primary.
This uses red loctite, which needs a breaker bar with a jack handle extension, to stand on.

 

[Norton Margie]

I think a trip to Home Depot is indicated to look for something repurposeable to jam in the gears. An impact wrench will just turn the primary chain faster. I have no problem torquing the nut, the problem is the gears turn, making nut torquing impossible.